Chocolate pound cake is a baking classic. Rich cocoa and butter are combined with sugar, flour and eggs to create a delightfully moist, dense cake suitable for special occasions or as an afternoon treat.

The secret ingredient in this dish is Chinese black vinegar. If you don't have this, substitute with young, unaged balsamic vinegar. The aged, good quality balsamic vinegar is too sweet so make sure you get the cheaper, young balsamic.